Friday, July 10, 2020

Remove Horizontal Tab in C

A program was written by my friend and fellow software engineer named Tom. Thank you Tom for sharing your code to us. This program will remove the horizontal tab and replace it with space using a C programming language.

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Program Listing

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <stdint.h>
#include <ctype.h>
#include <assert.h>

#include "debug.h"

void expand_tabs(char *src, char *dest, size_t nrepeat)
{
   assert(src != NULL);
   assert(dest != NULL);
   assert(nrepeat > 0);

   while (*src)
   {
     if (*src == '\t')
     {
       for (size_t i = 0; i < nrepeat; ++i)
         *dest++ = ' ';

       *src++;
     }
     else
     {
       *dest++ = *src++;
     }
   }
   *dest = '\0';
}

int main()
{
   char org_text[] = "1\t2\t3";
   char mod_text[sizeof(org_text) * 3 + 1] = {'\0'};

   puts("Tabs to spaces:");
   printf("Original text: %s\n", org_text);
   expand_tabs(org_text, mod_text, sizeof(org_text), 2);
   printf("Modified text: %s\n", mod_text);
}



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